Hydrogen separation from blended natural gas and hydrogen by Pd-based membranes |
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Affiliation: | 1. Institute on Membrane Technology of the Italian National Research Council (CNR-ITM), via P. Bucci 17/C, Rende, CS 87036, Italy;2. Faculty of Chemical Engineering, Urmia University of Technology, Urmia, Iran;3. Institute on Science and Molecular Technology of the Italian National Research Council (CNR-ISTM), via G. Fantoli 16, 15-20138 Milan, MI, Italy |
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Abstract: | Hydrogen separation membranes based on a heated metal foil of a palladium alloy, offer excellent permeability for hydrogen as a result of the solution-diffusion mechanism. Here, the possibility to separate hydrogen from the mixture of Natural Gas (NG) and hydrogen (NG+H2) with various NG concentrations using Pd, PdCu53 and PdAg24 hydrogen purification membranes is demonstrated. Hydrogen concentrations above ∼25% (for Pd and PdCu53) and ∼15% (for PdAg24) were required for the hydrogen separation to proceed at 400 °C and 5 bar pressure differential. Hydrogen permeability of the studied alloys could be almost fully recovered after switching the feed gas to pure hydrogen, indicating no significant interaction between the natural gas components and the membranes surface at the current experimental condition. Hydrogen flux of the membranes at various pressure differential was measured and no changes in the hydrogen permeation mechanism could be noticed under (NG 50%+H2) mixture. The hydrogen separation capability of the membranes is suggested to be mainly controlled by the operating temperature and the hydrogen partial pressure. |
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Keywords: | Hydrogen purification Pd-based membranes Blending Natural gas Hydrogen |
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